Remove HttpQuery.sendJsonArray() and .toJsonArray() as they're replaced by the
JSON class
Refactor HTTP API calls that return JSON to use the JSON class, no behaviors
are changed
Add HttpQuery.getCharset() to parse the proper encoding from the request or use the default UTF-8
Add HttpQuery.getContent() as a helper to decode the request body as a String using the given encoding
Add TestHttpQuery unit test class and quick/simple test for the query parsing methods, need to add tests for the sending methods
Add HttpQuery.getQueryPath() to fetch the path component of the requested URI
Add HttpQuery.explodePath() to fetch the path component of the requested URI
Break shared Netty mock/unit test methods into NettyMocks.java
Add tests for the HttpQuery mime private methods via reflection

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>